A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A) 20.9°
B) 47.5°
C) 51.8°
D) 30.0°
E) 14.9°
A
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A spring (k = 600 N/m) is at the bottom of a frictionless plane that makes an angle of 30° with the horizontal. The upper end of the spring is depressed 0.10 m, and a 2.0-kg block is placed against the depressed spring. The system is then released from rest. What is the kinetic energy of the block at the instant it has traveled 0.10 m and the spring has returned to its uncompressed length?
a. 2.0 J b. 1.8 J c. 2.2 J d. 1.6 J e. 1.0 J
A 2.00-g bullet hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.20-m long string. This causes the block to swing through an arc of 3.50°. What was the speed of the bullet before it hit the block?
A) 16.7 m/s B) 524 m/s C) 25.3 m/s D) 262 m/s E) 789 m/s
A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant?
a. 9.5 N b. 3.0 N c. 8.1 N d. 5.6 N e. 4.7 N
This person developed his own model in which the Sun and Moon orbited Earth and the planets circled the Sun
a. Galileo b. Newton c. Kepler d. Tycho